This extension is not support Unity 5.2.x or Higher !!!
'DP Unit for Canvas' is a realtime edit at device's physical size in dp unit or fit to game view.
WHY DP Unit ?.
Mobile devices are typically using dp unit instead px. Because it’s has different screen size and resolution. If you want to learn more about the dp unit please see link below.
http://www.google.com/design/articles/design-from-ios-to-android/
http://developer.android.com/guide/practices/screens_support.html
https://en.wikipedia.org/wiki/Device_independent_pixel
'DP Unit for Canvas' is created for developer who want to make application with Unity uGUI.
Supports : Unity 4.6 to 5.1.1 and Canvas render modes are supports “Screen Space – Overlay” and “Screen Space – Camera”